Mesa Arts Center

Investment Glass Casting
Instructor: Joshua Dopp

Thursday Nights 6-10 pm

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Creative Techniques Course

Class Overview
In this class, a variety of techniques will be demonstrated and discussed. Glass casting encompasses a wide variety of skills. Student interest will direct much of the lessons and class projects. A large part of this class is concerned with mold making. To really benefit from this class, I will ask you to work on your models outside of class time as much as possible. This will allow us more time in class to get through the time consuming process of mold making. We will look at various methods for filling the molds with glass. Detailed discussion and review of firing schedules will be taught along with explanation of different types of glass and their various attributes.

We will start with simple open-faced molds made from oil-based clay models. We will collaborate with the hot shop for a sand casting demo and, time permitting we will do some mold blowing. Towards the end of the session, I will introduce the lost wax method. Projects/topics covered in this course:

- Model making
- Open face molds
- Complex mold making
- Types of glass
- Sand-casting
- Plaster and rubber molds for wax casting
- Lost wax
- Cold working

1st class September 13, 2007 2-3 hour class
Introductory session: description of glass casting techniques with slides and history of glass casting. Student introductions and class schedule overview. Discussion of casting project. Open face investment mold. Glass casting theory. Model making material overview. Plasticine clay


2cd class September 20, 2007 3-4 hour class
Preview of models. Mold making and loading of kiln.
Further discussion, casting concerns: various types of model making materials, alternative investment materials, glass types appropriate for kiln casting.

Supplies Needed:

Model making materials and tools
By the nature that not everyone works in the same way or is interested in making the same thing, various materials and tools can be used to achieve the desired results. That being said, there are a few things, which will be helpful. Go to any art supply store in town and look at their clay and tools

Clay – you may want more.
Carving tools – endless choices, consider making your own, a few different-sized ribbon tools, wire for cutting
2 Buckets – small 1 gallon ones to start with

We will be using 50% Molding plaster and 50% Silica flour for our investment mold material. I will ask you to pay for this but MAC will purchase it and have it ready for us to use.

Glass – this can be expensive depending on the size of model and type of glass people want to use. Certain lead based casting glass can be as much as $ 7 a pound. We will discuss the type of glass we want to use weekly.
Cold working tools – MAC has some cold working tools, as do I, which I will bring later. Respirator - Or comfort mask for the dust. You must wear one of these!

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